From 179fa413b047bede6e32109e2ce82437c5fb8d34 Mon Sep 17 00:00:00 2001 From: MenTaLguY Date: Mon, 16 Jan 2006 02:36:01 +0000 Subject: moving trunk for module inkscape (bzr r1) --- src/draw-context.cpp | 664 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 664 insertions(+) create mode 100644 src/draw-context.cpp (limited to 'src/draw-context.cpp') diff --git a/src/draw-context.cpp b/src/draw-context.cpp new file mode 100644 index 000000000..ed1d6a7a4 --- /dev/null +++ b/src/draw-context.cpp @@ -0,0 +1,664 @@ +#define __SP_DRAW_CONTEXT_C__ + +/* + * Generic drawing context + * + * Author: + * Lauris Kaplinski + * + * Copyright (C) 2000 Lauris Kaplinski + * Copyright (C) 2000-2001 Ximian, Inc. + * Copyright (C) 2002 Lauris Kaplinski + * + * Released under GNU GPL, read the file 'COPYING' for more information + */ + +#define DRAW_VERBOSE + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif +#include + +#include "display/canvas-bpath.h" +#include "xml/repr.h" +#include "svg/svg.h" +#include +#include "libnr/n-art-bpath.h" +#include "desktop.h" +#include "desktop-affine.h" +#include "desktop-handles.h" +#include "desktop-style.h" +#include "document.h" +#include "draw-anchor.h" +#include "macros.h" +#include "message-stack.h" +#include "pen-context.h" +#include "prefs-utils.h" +#include "selection.h" +#include "selection-chemistry.h" +#include "snap.h" +#include "sp-path.h" + + +static void sp_draw_context_class_init(SPDrawContextClass *klass); +static void sp_draw_context_init(SPDrawContext *dc); +static void sp_draw_context_dispose(GObject *object); + +static void sp_draw_context_setup(SPEventContext *ec); +static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value); +static void sp_draw_context_finish(SPEventContext *ec); + +static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event); + +static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc); +static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc); + +static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel); + +static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc); + +static void spdc_reset_white(SPDrawContext *dc); +static void spdc_free_colors(SPDrawContext *dc); + + +static SPEventContextClass *draw_parent_class; + + +GType +sp_draw_context_get_type(void) +{ + static GType type = 0; + if (!type) { + GTypeInfo info = { + sizeof(SPDrawContextClass), + NULL, NULL, + (GClassInitFunc) sp_draw_context_class_init, + NULL, NULL, + sizeof(SPDrawContext), + 4, + (GInstanceInitFunc) sp_draw_context_init, + NULL, /* value_table */ + }; + type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0); + } + return type; +} + +static void +sp_draw_context_class_init(SPDrawContextClass *klass) +{ + GObjectClass *object_class; + SPEventContextClass *ec_class; + + object_class = (GObjectClass *)klass; + ec_class = (SPEventContextClass *) klass; + + draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass); + + object_class->dispose = sp_draw_context_dispose; + + ec_class->setup = sp_draw_context_setup; + ec_class->set = sp_draw_context_set; + ec_class->finish = sp_draw_context_finish; + ec_class->root_handler = sp_draw_context_root_handler; +} + +static void +sp_draw_context_init(SPDrawContext *dc) +{ + dc->attach = FALSE; + + dc->red_color = 0xff00007f; + dc->blue_color = 0x0000ff7f; + dc->green_color = 0x00ff007f; + dc->red_curve_is_valid = false; + + new (&dc->sel_changed_connection) sigc::connection(); + new (&dc->sel_modified_connection) sigc::connection(); +} + +static void +sp_draw_context_dispose(GObject *object) +{ + SPDrawContext *dc = SP_DRAW_CONTEXT(object); + + dc->sel_changed_connection.~connection(); + dc->sel_modified_connection.~connection(); + + if (dc->grab) { + sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME); + dc->grab = NULL; + } + + if (dc->selection) { + dc->selection = NULL; + } + + spdc_free_colors(dc); + + G_OBJECT_CLASS(draw_parent_class)->dispose(object); +} + +static void +sp_draw_context_setup(SPEventContext *ec) +{ + SPDrawContext *dc = SP_DRAW_CONTEXT(ec); + SPDesktop *dt = ec->desktop; + + if (((SPEventContextClass *) draw_parent_class)->setup) { + ((SPEventContextClass *) draw_parent_class)->setup(ec); + } + + dc->selection = SP_DT_SELECTION(dt); + + /* Connect signals to track selection changes */ + dc->sel_changed_connection = dc->selection->connectChanged( + sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc) + ); + dc->sel_modified_connection = dc->selection->connectModified( + sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc) + ); + + /* Create red bpath */ + dc->red_bpath = sp_canvas_bpath_new(SP_DT_SKETCH(ec->desktop), NULL); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + /* Create red curve */ + dc->red_curve = sp_curve_new_sized(4); + + /* Create blue bpath */ + dc->blue_bpath = sp_canvas_bpath_new(SP_DT_SKETCH(ec->desktop), NULL); + sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT); + /* Create blue curve */ + dc->blue_curve = sp_curve_new_sized(8); + + /* Create green curve */ + dc->green_curve = sp_curve_new_sized(64); + /* No green anchor by default */ + dc->green_anchor = NULL; + dc->green_closed = FALSE; + + dc->attach = TRUE; + spdc_attach_selection(dc, dc->selection); +} + +static void +sp_draw_context_finish(SPEventContext *ec) +{ + SPDrawContext *dc = SP_DRAW_CONTEXT(ec); + + dc->sel_changed_connection.disconnect(); + dc->sel_modified_connection.disconnect(); + + if (dc->grab) { + sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME); + } + + if (dc->selection) { + dc->selection = NULL; + } + + spdc_free_colors(dc); +} + +static void +sp_draw_context_set(SPEventContext *ec, const gchar *key, const gchar *value) +{ +} + +gint +sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event) +{ + //SPDrawContext *dc = SP_DRAW_CONTEXT(ec); + SPDesktop *desktop = ec->desktop; + + gint ret = FALSE; + + switch (event->type) { + case GDK_KEY_PRESS: + switch (get_group0_keyval (&event->key)) { + case GDK_Escape: + SP_DT_SELECTION(desktop)->clear(); + ret = TRUE; + break; + case GDK_Tab: // Tab - cycle selection forward + if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) { + sp_selection_item_next(); + ret = TRUE; + } + break; + case GDK_ISO_Left_Tab: // Shift Tab - cycle selection backward + if (!(MOD__CTRL_ONLY || (MOD__CTRL && MOD__SHIFT))) { + sp_selection_item_prev(); + ret = TRUE; + } + break; + case GDK_Up: + case GDK_Down: + case GDK_KP_Up: + case GDK_KP_Down: + // prevent the zoom field from activation + if (!MOD__CTRL_ONLY) { + ret = TRUE; + } + break; + default: + break; + } + break; + default: + break; + } + + if (!ret) { + if (((SPEventContextClass *) draw_parent_class)->root_handler) { + ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event); + } + } + + return ret; +} + + +/* + * Selection handlers + */ + +static void +spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc) +{ + if (dc->attach) { + spdc_attach_selection(dc, sel); + } +} + +/* fixme: We have to ensure this is not delayed (Lauris) */ + +static void +spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc) +{ + if (dc->attach) { + spdc_attach_selection(dc, sel); + } +} + +static void +spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel) +{ + /* We reset white and forget white/start/end anchors */ + spdc_reset_white(dc); + dc->sa = NULL; + dc->ea = NULL; + + SPItem *item = dc->selection ? dc->selection->singleItem() : NULL; + + if ( item && SP_IS_PATH(item) ) { + /* Create new white data */ + /* Item */ + dc->white_item = item; + /* Curve list */ + /* We keep it in desktop coordinates to eliminate calculation errors */ + SPCurve *norm = sp_shape_get_curve(SP_SHAPE(item)); + sp_curve_transform(norm, sp_item_i2d_affine(dc->white_item)); + g_return_if_fail( norm != NULL ); + dc->white_curves = sp_curve_split(norm); + sp_curve_unref(norm); + /* Anchor list */ + for (GSList *l = dc->white_curves; l != NULL; l = l->next) { + SPCurve *c; + c = (SPCurve*)l->data; + g_return_if_fail( c->end > 1 ); + if ( c->bpath->code == NR_MOVETO_OPEN ) { + NArtBpath *s, *e; + SPDrawAnchor *a; + s = sp_curve_first_bpath(c); + e = sp_curve_last_bpath(c); + a = sp_draw_anchor_new(dc, c, TRUE, NR::Point(s->x3, s->y3)); + dc->white_anchors = g_slist_prepend(dc->white_anchors, a); + a = sp_draw_anchor_new(dc, c, FALSE, NR::Point(e->x3, e->y3)); + dc->white_anchors = g_slist_prepend(dc->white_anchors, a); + } + } + /* fixme: recalculate active anchor? */ + } +} + + +/** + * Snaps node or handle to PI/rotationsnapsperpi degree increments. + * + * \param dc draw context + * \param p cursor point (to be changed by snapping) + * \param o origin point + * \param state keyboard state to check if ctrl was pressed +*/ + +void spdc_endpoint_snap_rotation(SPEventContext const *const ec, NR::Point &p, NR::Point const o, + guint state) +{ + /* Control must be down for this snap to work */ + if ((state & GDK_CONTROL_MASK) == 0) { + return; + } + + unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12)); + /* 0 means no snapping. */ + + /* mirrored by fabs, so this corresponds to 15 degrees */ + NR::Point best; /* best solution */ + double bn = NR_HUGE; /* best normal */ + double bdot = 0; + NR::Point v = NR::Point(0, 1); + double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps); + double const r10 = -r01, r11 = r00; + + NR::Point delta = p - o; + + for (unsigned i = 0; i < snaps; i++) { + double const ndot = fabs(dot(v,NR::rot90(delta))); + NR::Point t(r00*v[NR::X] + r01*v[NR::Y], + r10*v[NR::X] + r11*v[NR::Y]); + if (ndot < bn) { + /* I think it is better numerically to use the normal, rather than the dot product + * to assess solutions, but I haven't proven it. */ + bn = ndot; + best = v; + bdot = dot(v, delta); + } + v = t; + } + + if (fabs(bdot) > 0) { + p = o + bdot * best; + + /* Snap it along best vector */ + SnapManager const m(SP_EVENT_CONTEXT_DESKTOP(ec)->namedview); + p = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT | Inkscape::Snapper::BBOX_POINT, + p, best, NULL).getPoint(); + } +} + + +void spdc_endpoint_snap_free(SPEventContext const * const ec, NR::Point& p, guint const state) +{ + /* Shift disables this snap */ + if (state & GDK_SHIFT_MASK) { + return; + } + + /* FIXME: this should be doing bbox snap as well */ + SnapManager const m(SP_EVENT_CONTEXT_DESKTOP(ec)->namedview); + p = m.freeSnap(Inkscape::Snapper::BBOX_POINT | Inkscape::Snapper::SNAP_POINT, p, NULL).getPoint(); +} + +static SPCurve * +reverse_then_unref(SPCurve *orig) +{ + SPCurve *ret = sp_curve_reverse(orig); + sp_curve_unref(orig); + return ret; +} + +/** + * Concats red, blue and green. + * If any anchors are defined, process these, optionally removing curves from white list + * Invoke _flush_white to write result back to object. + */ +void +spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed) +{ + /* Concat RBG */ + SPCurve *c = dc->green_curve; + + /* Green */ + dc->green_curve = sp_curve_new_sized(64); + while (dc->green_bpaths) { + gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data)); + dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data); + } + /* Blue */ + sp_curve_append_continuous(c, dc->blue_curve, 0.0625); + sp_curve_reset(dc->blue_curve); + sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL); + /* Red */ + if (dc->red_curve_is_valid) { + sp_curve_append_continuous(c, dc->red_curve, 0.0625); + } + sp_curve_reset(dc->red_curve); + sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL); + + if (sp_curve_empty(c)) { + sp_curve_unref(c); + return; + } + + /* Step A - test, whether we ended on green anchor */ + if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) { + // We hit green anchor, closing Green-Blue-Red + SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed.")); + sp_curve_closepath_current(c); + /* Closed path, just flush */ + spdc_flush_white(dc, c); + sp_curve_unref(c); + return; + } + + /* Step B - both start and end anchored to same curve */ + if ( dc->sa && dc->ea + && ( dc->sa->curve == dc->ea->curve ) + && ( ( dc->sa != dc->ea ) + || dc->sa->curve->closed ) ) + { + // We hit bot start and end of single curve, closing paths + SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path.")); + if (dc->sa->start && !(dc->sa->curve->closed) ) { + c = reverse_then_unref(c); + } + sp_curve_append_continuous(dc->sa->curve, c, 0.0625); + sp_curve_unref(c); + sp_curve_closepath_current(dc->sa->curve); + spdc_flush_white(dc, NULL); + return; + } + + /* Step C - test start */ + if (dc->sa) { + SPCurve *s = dc->sa->curve; + dc->white_curves = g_slist_remove(dc->white_curves, s); + if (dc->sa->start) { + s = reverse_then_unref(s); + } + sp_curve_append_continuous(s, c, 0.0625); + sp_curve_unref(c); + c = s; + } else /* Step D - test end */ if (dc->ea) { + SPCurve *e = dc->ea->curve; + dc->white_curves = g_slist_remove(dc->white_curves, e); + if (!dc->ea->start) { + e = reverse_then_unref(e); + } + sp_curve_append_continuous(c, e, 0.0625); + sp_curve_unref(e); + } + + + spdc_flush_white(dc, c); + + sp_curve_unref(c); +} + +static char const * +tool_name(SPDrawContext *dc) +{ + return ( SP_IS_PEN_CONTEXT(dc) + ? "tools.freehand.pen" + : "tools.freehand.pencil" ); +} + +/* + * Flushes white curve(s) and additional curve into object + * + * No cleaning of colored curves - this has to be done by caller + * No rereading of white data, so if you cannot rely on ::modified, do it in caller + * + */ + +static void +spdc_flush_white(SPDrawContext *dc, SPCurve *gc) +{ + SPCurve *c; + + if (dc->white_curves) { + g_assert(dc->white_item); + c = sp_curve_concat(dc->white_curves); + g_slist_free(dc->white_curves); + dc->white_curves = NULL; + if (gc) { + sp_curve_append(c, gc, FALSE); + } + } else if (gc) { + c = gc; + sp_curve_ref(c); + } else { + return; + } + + /* Now we have to go back to item coordinates at last */ + sp_curve_transform(c, ( dc->white_item + ? sp_item_dt2i_affine(dc->white_item) + : sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc)) )); + + SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc); + SPDocument *doc = SP_DT_DOCUMENT(desktop); + + if ( c && !sp_curve_empty(c) ) { + /* We actually have something to write */ + + Inkscape::XML::Node *repr; + if (dc->white_item) { + repr = SP_OBJECT_REPR(dc->white_item); + } else { + repr = sp_repr_new("svg:path"); + /* Set style */ + sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false); + } + + gchar *str = sp_svg_write_path(SP_CURVE_BPATH(c)); + g_assert( str != NULL ); + repr->setAttribute("d", str); + g_free(str); + + if (!dc->white_item) { + /* Attach repr */ + SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr)); + dc->selection->set(repr); + Inkscape::GC::release(repr); + item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer()); + item->updateRepr(); + } + + sp_document_done(doc); + } + + sp_curve_unref(c); + + /* Flush pending updates */ + sp_document_ensure_up_to_date(doc); +} + +/** + * Returns FIRST active anchor (the activated one). + */ +SPDrawAnchor * +spdc_test_inside(SPDrawContext *dc, NR::Point p) +{ + SPDrawAnchor *active = NULL; + + /* Test green anchor */ + if (dc->green_anchor) { + active = sp_draw_anchor_test(dc->green_anchor, p, TRUE); + } + + for (GSList *l = dc->white_anchors; l != NULL; l = l->next) { + SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active); + if ( !active && na ) { + active = na; + } + } + + return active; +} + +static void +spdc_reset_white(SPDrawContext *dc) +{ + if (dc->white_item) { + /* We do not hold refcount */ + dc->white_item = NULL; + } + while (dc->white_curves) { + sp_curve_unref((SPCurve *) dc->white_curves->data); + dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data); + } + while (dc->white_anchors) { + sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data); + dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data); + } +} + +static void +spdc_free_colors(SPDrawContext *dc) +{ + /* Red */ + if (dc->red_bpath) { + gtk_object_destroy(GTK_OBJECT(dc->red_bpath)); + dc->red_bpath = NULL; + } + if (dc->red_curve) { + dc->red_curve = sp_curve_unref(dc->red_curve); + } + /* Blue */ + if (dc->blue_bpath) { + gtk_object_destroy(GTK_OBJECT(dc->blue_bpath)); + dc->blue_bpath = NULL; + } + if (dc->blue_curve) { + dc->blue_curve = sp_curve_unref(dc->blue_curve); + } + /* Green */ + while (dc->green_bpaths) { + gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data)); + dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data); + } + if (dc->green_curve) { + dc->green_curve = sp_curve_unref(dc->green_curve); + } + if (dc->green_anchor) { + dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor); + } + /* White */ + if (dc->white_item) { + /* We do not hold refcount */ + dc->white_item = NULL; + } + while (dc->white_curves) { + sp_curve_unref((SPCurve *) dc->white_curves->data); + dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data); + } + while (dc->white_anchors) { + sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data); + dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data); + } +} + + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 : -- cgit v1.2.3